Scenario
You have multiple email domains set up within your Tenant:
admin@crosswaredemo.com
admin@paperface.com
Your signature configuration is selected for one of the above.
Or your user account is "admin@crosswaredemo.com" but your email address is "admin@paperface.com"
Messages sent out with this configuration may have erratic results when appending a signature.
Solution
Creating an M365 Group
1. Log into your M365 Exchange Admin Center > Click the Recipients drop-down > Select Groups > Click Add a group to create the group (preferably a Distribution list group)
2. Add Members to the specific group.
Creating a Google Group
1. Log into your Google Admin Console > Go to the Directory drop-down option > Select Groups > Click Create group to add a new group
2.
Assign the signature to the group created.
1. Log into your Crossware portal using your M365 global admin/portal admin account or your Google Workspace admin/portal admin account > Select the signature that needs assigning by clicking the Edit signature button.
2. Assign the recently created group by clicking the drop-down option under the Who is this signature for? > Select the Group option and search for the group using the search tool and click Add Group once you see the group. When the signature has been assigned, click SAVE & CLOSE to save any change(s) made.